@book{2692,
	author = {Putnam, William Clement, and Birkeland, Peter W.},
	title = {Putnam's geology.},
	publisher = {Oxford University Press,},
	year = {1989.},
	address = {New York :},
	edition = {5th ed. /},
	url = {http://www.loc.gov/catdir/enhancements/fy0637/88004007-t.html}
}